Eollee mill



2 Sheets-Sheet 1.

` (No Model.)

N. W. HOLT.

ROLLER MILL. No. 310,430. Patented Jian. .6, 1885.

(No Model.) 2 shamsheet 2. N. W. HOLT.

ROLLERMLL.

No. 310,430. Patented Ja11.6, 1885.

Ab J UNITED STATES PATENT OFFICE.

NOAH V. HOLT, OF BUFFALO, NEV YORK.

ROLLER-MILL.

SPECIFICATION forming part of Letters Patent No. 310,430, dated January 6, 1885.

Application filed October 9.3, 1883. (No model.)

To @ZZ whom it may concern.-

Be it known that I, NOAH XV. HOLT, of the city of Buffalo, in the county of Erie and State of N ew York, have-invented new and useful Improvements in Boller- Mills, of which the following is a specification.

This invention relates to an improvement in that class of roller-mills which are employed for the reduction of grain, and more particularly to such roller-mills in which one of the rollers is mounted in movable bearings, so that it can be moved toward or from the other roller in adjusting Vthe working-faces of the rollers for grinding or reducing the material to the desired degree of fineness, and also for separating the rollers when the feed is shut off.

The object of this invention is to provide means for adjusting the rollers mounted in stationary bearings, so as to render them parallel with the rollers mounted in movable bearings, and to provide means for adjusting the movable bearings of the opposite roller both separately and simultaneously, and to separate the roller mounted in movable bearings from the roller mounted in stationary bearings without disturbing the grinding adj justment.

My invention consists to these ends of the improvements which will be hereinafter fully set forth, and pointed out in the claims.

In the accompanying drawings, consisting of three sheets, Figure l is a side elevation of a roller-mill, partly in section, provided with my improvements. Fig. 2 is a top plan View of a roller-mill with the casing inclosing the rollers in section. Fig. 3 is a vertical section on an enlarged scale of one of the stationary rollerbearings. Fig. 4: is a horizontal section in line x x, Fig. 3. Fig. 5 is a vertical longitudinal section of the adjusting devices applied to one of the movable bearings, on an enlarged scale. Fig. 6 is a vertical cross-section in line x, Fig. 5. Fig. 7 is a horizontal section in line y y, Fig. 6. Fig. 8 is a vertical section in line z z, Fig. 7, looking outwardly.

Like letters of reference refer to like parts in the several figures.

A A represent two pairs of crushing or grinding rollers of any suitable and wellknown construction.

a a represent the journals of said rollers, and A2 represents the casing which incloses the rollers.

B B represent the stationary bearings which support the journals a of the rollers A, and O O represent the movable bearings which support the journals a of the rollers A.

D represents the supporting-frame, to which the bearings B and C are attached. The stationary bearings B are secured to the frame D in such manner that they can be adjusted to stand in line with the axis of the rollers, thereby preventing binding of the journals in the bearings, and so that they can be adjusted vertically to render the axis of the roller parallel with the axis ofthe opposing roller. Each of the bearings B is supported by a pivot, d, which is seated in a circular recess, d', in the under side of the bearing, and in a similar recess in the upper side of the frame D, and which is made vertically adjustable by means of a set-screw, d2, which works in a threaded opening in the frame D, and bears against the under side of the pivot or disk d.

E represents a bracket or standard, which is secured to the upper side of the frame D on the inner side of the bearing B, and e represents a horizontal bolt passing through a vertical elongated opening, e', in the bracket E and tapping into the bearings B, whereby the bearing is secured to the standard E. The bearing B is constructed with a cylindrical bearing-surface, ci, made concentric with the axis ofthe pivot d, and the outer side of the standard E is provided with a corresponding concave'bearing-surface, c, so that before the bearing is secured to the standard by the bolt e the bearing can swivel on the pivot d as a center in adjusting itself to the position of the roller-journal c. After the bearings B at bothl ends of the roller A have been adjusted on their pivots to properly support the j ournals a, the holes are tapped into the bearings B for the reception of the bolts e, and said bolts are applied and tightened in the bearings B, and the bolts d are tightened by means of jam-nuts d3, whereby the bearing is firmly secured in position. Each ofthe bearings B may bereadily adjusted vertically when necessary, in order to render the axis of the roller A parallel ICO with the axis of the roller A. The bearings C are arranged to slide on the frame D toward and from the bearings B.

c represents horizontal screw-bolts, which I engage with their inner threaded ends in threaded openings in the bearings C, and c represents externally-threaded sleeves, which surround the bolts c, and pass through lugs e2 cast on the frame D.

f represent-s screw-nuts, which work on the external threads of the sleeves c', and j" are spiral springs, which are interposed between the bearings C and the screw-nutsf, and which surround the bolts c and tend to move the bearings C toward the bearings B.

g represents heads, which are formed on the outer ends of the threaded sleeves c, and which are provided on their inner sides with forwardly-proj ecting noses g.

3 G represents hand-wheels, which are firmly secured to the outer ends of the bolts c for turning the same.

H represents bearings hung loosely on the bolts' c between the hand-wheels G and the 5 heads g, and 71, represents a transverse shaft,

which is supported with its ends in the bearings H on the same end of the machine, and provided near both ends with a flattened or eccentric portion, h, arranged opposite the g noses g of the heads g, and adapted to bear against the saine. The bearings I-I are provided with sleeves h2, through which the noses g project inwardly against the flattened or ec centric portions it of the shaft It.

5 I represents actuatinglevers secured to the shafts lt on the saine side of the machine, and connected by a rod, i, so that both the levers I are moved simultaneously. Each of the levers I is provided with a sleeve-bearing, J, which o is pivoted to the end of the lever, as shown at j, and which supports the adjacent end of the rod t', which passes through said bearing. The outer portion of the bearing is provided with an external screw-thread, upon which works 5 an internally-threaded sleeve, k.

. K represents hand-wheels firmly secured to the reduced ends of the rod t', which form shoulders Z, between which and the hand-wheels the hubs of the screwnuts k are confined.

5o Vhen the parts are in the position represented in Figs. 2, 5, and 7 and in full lines in Fig. l, the rollers are in their working position. Upon shifting the levers I to the position represented by dotted lines in Fig. l the 55 eccentric portions It of the shafts It bear against the projections g', forcing the bearings II and the hand-wheels G and screw-bolts c outwardly, thereby moving the bearings C away from the bearings B and separating the 6o working-faces of the rollers and compressing the springs f. This movement is resorted to for the purpose of spreading the rollers when the feed is shut off or the operation of grinding otherwise interrupted. Upon returning 6 5 the levers I to their former position the bearings C and the rollers A are returned to their former positions by the pressure of the springs f. By turning the screw-bolt c each of the movable bearings C can be adjusted independent of the other, if required, to render the rollers parallel with each other. By turning the screw-sleeve k the shaft h is turned, and

- both bearings C of the same roller are adj usted simultaneously.

In order to avoid longitudinal displacement of the rod t' when the screw-sleeve 7c is turned, the rod is provided with a dog, m, which can be engaged between jaws m, secured to the side of the casing A2, before adjusting the screw-sleeve 7c, and which serves to hold the rod t' against longitudinal motion. rIhis adjustment is resorted to for regulating the grinding adj nstment of the rollers, and is not disturbed by spreading the rollers.

It will be seen from the foregoing that the bearings of the rollers A can be readily adjusted to place the rollers parallel with each other, that each of the movable rollers can be adjusted independently to further facilitate the arrangement of the working-faces of the rollers in parallel line, and that both movable bearings C of the same roller can be simultaneously adj listed to increase or reduce the distance .between the working-faces of the rollers when necessary for altering the grinding, and that both bearings C can be moved outwardly or away from the stationary bearings B in order to separate the rollers when the operation of grinding is required to be interrupted, and which interferes with the grinding adjustment of the rollers.

I claim as my invention-- l. The combination, ywith the main frame D, of a bearing-box constructed with a convex back, a standard, E, secured to the frame, and

provided with a concave face, in which the convex back of the bearing-box is seated, and a vertically-adjustable pivot, which supports the bearing-box on said frame, the convex and concave contact-surfaces of the bearing-box and standard being curved concentric with the axis of said supporting-pivot, whereby said bearing-box can be turned on the supportingpivot while resting against the supportingstandard, substantially as set forth.

2. The combination,wtl1 the movable bearings C, of adjusting-rods c, tubular screws c', provided with projections g', springs f', and screw-nuts f, hand-wheels G, shaft h, provided with eccentrics h', and bearings' H, substantially as set forth.

3. In a roller-mill provided with two pairs of rollers, the outer rollers being mounted in movable boxes C, adjusting-devices whereby each movable box can be adjusted independently, shafts h, provided with eccentrics h', and mechanism whereby both movable bearings of the same roller can be adj usted simul taneously to separate the rollers by turning the shafts It, levers I, secured to the shafts h, a rod, t', connecting said levers, and mechanism applied to the ends of said rod, whereby IOO each lever can be adjusted to regulate the grinding adjustment, substantially as set forth.

4. The combination, withthe levers I Iand mechanism whereby the movable boXes can be adjusted independently and simultaneously, of the connecting-rod z, mechanism whereby the connecting-rod can be held against longitudinal movement, and mechanism whereby each lever can be adjusted on the connectingrod, substantially as set forth.

5. The combination, With the levers I and eonneetingrod i, of pivoted bearings J, handwheels K, and serewsleeves 7.:, substantially as set forth.

6. The eon1bination,witl1 the levers I I, con- 15 lneeting-rod t', and means whereby the levers are adjustably connected to the connectingrod, dog 911, and fixed jaws m', substantially as set forth.

fitness my hand this 15th day of October, 2o

CARL F. GEYER, Crus. J. Buennnrr. 

